Fibres are produced from chips of wood (mainly from forest thinnings), which are reduced to a pulp by mechanical or pressure heating methods. The pulp is mixed with water and other additives, formed on a flat surface and pressed at high temperature. In most fibreboards the basic strength and adhesion is obtained from the felting together of the fibres themselves and from their own inherent adhesive properties. There are three basic types of boards, differentiated by their increasing density; insulation board, Medium board and hardboard.
